考察了添加在镍基催化剂中的碱土金属助剂对甲烷与空气制合成气的催化反应性能的影响。并对催化剂用TPO、TPR、CO2 TPD、XPS及CO脉冲色谱对催化剂进行了表征。实验表明 ,碱土金属助剂对降低催化剂结炭有一定的作用 ,催化剂抗积炭顺序为...考察了添加在镍基催化剂中的碱土金属助剂对甲烷与空气制合成气的催化反应性能的影响。并对催化剂用TPO、TPR、CO2 TPD、XPS及CO脉冲色谱对催化剂进行了表征。实验表明 ,碱土金属助剂对降低催化剂结炭有一定的作用 ,催化剂抗积炭顺序为Ni BaO CaO Al2 O3>Ni SrO CaO Al2 O3>Ni MgO CaO Al2 O3>Ni CaO Al2 O3。而且 ,添加了碱土金属催化剂的Ni晶粒减小、结合能负位移和催化剂吸附CO2 的能力变化顺序都与积炭量减少顺序一致。其中尤以Ni BaO CaO Al2 O3 催化剂既有较高的活性 。展开更多
The reaction of methane with CO2 and H2O using catalyst MCD-2(a-Al2O3 with15%～17% impregnated NiO) has been investigated. After a 500 h continuous run underconditions: n (CH4): n(CO2): n(H2O)= 1: 1. 5: 0. 9,CH4 space...The reaction of methane with CO2 and H2O using catalyst MCD-2(a-Al2O3 with15%～17% impregnated NiO) has been investigated. After a 500 h continuous run underconditions: n (CH4): n(CO2): n(H2O)= 1: 1. 5: 0. 9,CH4 space velocity 1000 h-1,tem temperature 600～900℃ and 0. 6 MPa, it is found that the porous structure, mechanicalstrength,content of active nickel,XRD patterns and content of deposited carbon on the catalyst did not change drastically and the activity of the catalyst kept steady with the CH4 conversion,CO content on the product gas and H2/CO ratio being ≥92%, ～40% and ～1respectively.展开更多
文摘考察了添加在镍基催化剂中的碱土金属助剂对甲烷与空气制合成气的催化反应性能的影响。并对催化剂用TPO、TPR、CO2 TPD、XPS及CO脉冲色谱对催化剂进行了表征。实验表明 ,碱土金属助剂对降低催化剂结炭有一定的作用 ,催化剂抗积炭顺序为Ni BaO CaO Al2 O3>Ni SrO CaO Al2 O3>Ni MgO CaO Al2 O3>Ni CaO Al2 O3。而且 ,添加了碱土金属催化剂的Ni晶粒减小、结合能负位移和催化剂吸附CO2 的能力变化顺序都与积炭量减少顺序一致。其中尤以Ni BaO CaO Al2 O3 催化剂既有较高的活性 。
文摘The reaction of methane with CO2 and H2O using catalyst MCD-2(a-Al2O3 with15%～17% impregnated NiO) has been investigated. After a 500 h continuous run underconditions: n (CH4): n(CO2): n(H2O)= 1: 1. 5: 0. 9,CH4 space velocity 1000 h-1,tem temperature 600～900℃ and 0. 6 MPa, it is found that the porous structure, mechanicalstrength,content of active nickel,XRD patterns and content of deposited carbon on the catalyst did not change drastically and the activity of the catalyst kept steady with the CH4 conversion,CO content on the product gas and H2/CO ratio being ≥92%, ～40% and ～1respectively.
